What do WHO and EMA mean when they say the benefits outweigh the risks of vaccination?

WHO and EMA have assessed available data and determined that the benefits of vaccination, namely the tremendous potential to prevent infections and reduce deaths across the world, outweigh the possible but very small risk of suffering any serious adverse event following vaccination.

Concretely in the case of severe thromboembolic events and thrombocytopenia association, irrespective of the existence or not of a causal link with vaccination, the noted frequency is less than 1 per 100.000 doses administered to date[^1].